$\left(\left(x+y\right)+5z\right)\left(\left(x+y\right)-5z\right)$
$\lim_{x\to-2}\:-10$
$\left(-20\right)^5$
$y^{2}-x^{2}=1$
$3a-2b\cdot2a-b$
$mx^2^{m+3}+3x^{m+5}$
$\left(5c+\frac{1}{2}\right)^3$
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